Webster's Revised Unabridged Dictionary · 1913

Precarious

Precarious , adjective

[Latin precarius obtained by begging or prayer, depending on request or on the will of another, from precari to pray, beg. See Pray.]

1.
Depending on the will or pleasure of another; held by courtesy; liable to be changed or lost at the pleasure of another; as, precarious privileges. — Addison
2.
Held by a doubtful tenure; depending on unknown causes or events; exposed to constant risk; not to be depended on for certainty or stability; uncertain; as, a precarious state of health; precarious fortunes.
Intervals of partial and precarious liberty. — Macaulay